nice nature (umamusume), umamusume, highres, official art, 1girl, animal ears, ascot, black dress, black skirt, breasts, brown eyes, brown shoes, closed mouth, dot nose, dress, ear covers, female focus, frilled dress, frilled skirt, frills, full body, green ascot, hand on own hip, horse ears, horse girl, horse tail, juliet sleeves, legs, long sleeves, looking at viewer, o-ring, o-ring thigh strap, puffy sleeves, red hair, red straps, red tail, shoes, skirt, small breasts, solo, solo focus, tail, thigh strap, thighs, twintails